How to log port assignments and opening and closing?

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jringoot
Posts: 4
Joined: 2010/03/01 09:24:41

How to log port assignments and opening and closing?

Post by jringoot » 2020/04/30 14:07:38

I am trying to find a good/easy way to log ports assignments and opening and closing them in linux. It should log at least every 10 seconds. (So crontab is not a good option=minumum interval is 1 minute)

Until now the best option I could come up with is trying to use systemd timers to start this

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ss -aenp &>> /var/log/sslog-`date +%F`.log
Or for transmission:

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systemd-run --on-calendar="*-*-* *:*:*/6" ss -aenp | grep transmi &>> /var/log/sslog-`date +%F`.log
But it is not working

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root@localhost:~# systemd-run --on-calendar="*-*-* *:*:1/6" ss -aenp | grep transmi &>> /var/log/ss-`date +%F`.log
Running timer as unit: run-r4f7f393ed93d4b7ca0e5097ebfa679ec.timer
Will run service as unit: run-r4f7f393ed93d4b7ca0e5097ebfa679ec.service
root@localhost:~# updatedb
root@localhost:~# locate run-r4f7f393ed93d4b7ca0e5097ebfa679ec.timer
root@localhost:~# locate run-r4f7f393ed93d4b7ca0e5097ebfa679ec.service
root@localhost:~# 
root@localhost:~# ls -al /var/log/ss-*
-rw-r--r-- 1 root root 0 Apr 30 15:45 /var/log/ss-2020-04-30.log
root@localhost:~# 
The log keeps emtpty and the created timer files cannot be found.

BTW: this bevaviour is the same on centos 8 and debian 10, (yes crossposted on ubuntu/debian)

What could have went wrong?

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KernelOops
Posts: 322
Joined: 2013/12/18 15:04:03
Location: xfs file system

Re: How to log port assignments and opening and closing?

Post by KernelOops » 2020/04/30 14:43:03

Instead of oncalendar, try the solution described here:

https://stackoverflow.com/a/53557536
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TrevorH
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Location: Brighton, UK

Re: How to log port assignments and opening and closing?

Post by TrevorH » 2020/04/30 15:18:46

What are you really trying to do ? The end goal of this that is?
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